estrogen
Oestrogen, Progesterone and small amounts of Androgen and Testosterone (male hormones) are produced in the Ovaries. Oestrogen: regulates the menstrual cycle and prepares the breasts for milk production. Progesterone: prepares the lining of the uterus, for implantation of a fertilized egg, and helps maintain the pregnancy.
Progesterone levels rise after ovulation to protect the fertilized egg and to prevent the uterine lining from shedding allowing the fertilized ovum to implant in the lining. Progesterone protects the zygote until hCG kicks in after implantation.
Well, of course. Menstruation is what prepares the uterus for the implantation of the fertilized egg during the ovulation that follows it. You can't get pregnant DURING your period (usually).
The Uterus
Menstruation
The uterus prepares for the arrival of a fertilized egg.
Name of that hormone is 'Estrogen'. It is called as 'Oestrogen' in British English. It prepares the uterus for pregnancy. It is secreted by the follicles in the ovary.
Menstrual cycle
No, menstration is the womb emptying after it prepares for a baby that is not fertilized. If it is, it will not empty.
Labor and delivery.
Menstrual cycle is about 28 days that prepares the body for pregnancy.
The lining of the uterus breaking apart is the mucus lining that is usually formed so as to create a conducive environment for a fertilized egg to develop. If the ovum is not fertilized, the thick lining breaks apart which is what causes menstruation.